Educational device



March 28, 1950 F. A. WADE ET AL 2,502,238

\ EDUCATIONAL DEVICE FiledAug. 2o, 1947 EEE- Taqf?. A' figa.

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v ATTORNEYS Patented Mar. 28, 1950 sor-zn EDUCATIONAL DEVICE' FrancisA. Wadefand Willialrr,Mei'fznerg';` Philadelphia, ,1?a..4

ApplicationAugust', 1947, Serial No. 7 69,6697-` 4;.Clams:; (Cl. 35e-3151;

The'ffpresentr .invention yrelates to# educational devicesrandtmore particularly-to a,noverhundredl board tassenfrbly i for. teaching.` counting, the proc; essesfoffaddition f and: subtraction, the multiplicas tienecombinations;V andrfthe basic cenceptsiin` 5fv volvedfin decimalraetiong and percentage:

Somev of the .Y obiects offfther present` invention.. are: toprovide av novel device for teacl'iingarith-` metic meaningiulyfso that children will under-` standuthe :quantities.and^ relationships that. are 10 implieclfin the: names, symbols,- and. operations used.; to provideraboard assemblyK sor that groups: of: vdisks may beiarrangedsand re-arranged thereonzxtopromote understanding of the Aarithn'retical processes.;` .tov provide :aI plural'ty oicifrar-ts.'having 15 numbers. arranged thereon' in?, af. predetermined manner toY promote arithmetical understanding; such .charts beingV adapted-for association with the mounting frame; to provide aaplurality of disks to berusedinconcealing the numbers onrsaid 20` charts.; tot provide ai novel maskingmeans pro viddizwthfa pivot tosegregate for study quan@ titiesiot disks ineoountingcr multiplication,` soi. that the-:.pnpills answers will i berself-'cheokingfon the. cardnbeneath; to provide.` other masking 25..

meanssoithat thesarea of the-board and conse--y quently'the. number ofthe disks-'in vievvf canbe variedtand thus enablerthezteaeher to present only certainitables at one time; to providestillnother maskingmeansso that'different patterns `of disksl 30..`

may be` uncovered and: thuspresentrthe aritln-y metica'l. problem situation-,of determining hovv` many; disks are exposed; and to provide othery improvements'as will hereinafter appear.

Intheiaceompanying drawings Fig. 1 represents i 35,;

affpl-anV of a chart teaehngframe shoW-ng a chart: thereinfior number. counting.; Fig. Zrepresents-y a= seetonronrline V2,-2 `of Fig. l; Fig. Srep-resents a plan'of a-second chart :for/use with theframe, they same being arranged for productteaching; Fig'. 4v 401.

represents 1 a .perspective off any one of thel disks used: Withthe charts; Fig; 51 represents a perspec-v tive of any one of the'disks used with the charts butzshowing the :side oppositeA to .that shown in Fig. 4f; Fig; 6 represents a plan of the frame shovv- 45.y

p1an'.,of.-the framev with the productfcard placed.- 552:;

therein Aand'all. lfthe numbers covered with disks except theonefdiskiat theangle of themasking means, which'.l diskhas -sbeeniremovedf to showthe totali: numberdisks' contained`y inthe exposed. area;

andFig. 9 represents. ai plan of theframe show-f.I

insr amodYA edform of the invention.v

Referring to.thedrawings,=one form ofthe prese ent invention comprises a. frame 10,: prefeablyof: iv

rectangular shape, having.: a\.medially disposed board `I l ymounted; therein-to provide framedre= cesses. a-tz.o1: posite4 sides forrespectively receiving teachinglcharts for number andfproduct counting.

usein the frame, maand. has ynumbers from 1 to 100.` printed thereon in rotationrinfparallel. hor-- zontal rows of ten each. The chart |22 is a sep-. arate unit arrangedto be 1placedv in -eitherof 'i-the framerecesses, and may,y if desired, loe-fastenedl temporarily in place by.` anywellkno-Wn means.` Another `such chart i3, likewiseof. a size to t Withnroneoff'the frame reces-es, has nrrrlbers4 printed thereon forfrnu-ltiplicationproducts, that is, the-rows run horizontallyandrparallel in 1 to4` 10,n 2 to 20,13*-110-30 rel-ation:'successively-to the last row-0f 10i t0'100;

For use separately oriwith'and in `associationwith eachf'chart', one hundred disks i4 of circular'v form areprovded=,= all preferably-of the same ydi ameter= which isfrthat necessary to cover eachVVV number -upon av chart' and to t` snugly inthe frame. Thus; in Fig; 6 allot the disks Ill-'are inA placeewithoutfa chart, certain offsuch disks being v turned over to: expose" the-eblack or contrasting colorl of the disks. In thefshowing-oi Fig, 6 there are-twentyeseven disks lreversed in position in adjacent rows, namely two-complete rows and seven inthe thrd rowi Since a row :of'Jthe--dsksis al tenthfof'thegchart; andsin-gle disks are-a hundredth of thecharnthe. resultrisLsh-own as a `decis mal fraction, namelyv.27

Small .edualfgroups of I disksn may be placed fat one; end ofthe blankzboard without using either chartiand `then-.rearranged atthe other end in vtens and ones, thus demonstrating, for example,

that threefgroups of-.four disks may be rearranged asia 10 andtwotlis, orvthat three-ifs are-.reallyA twelve..- Conversely, twelve disksarranged at .the endof ,the board-asa l0 and1twols.\may.be rear-k rangedinto; threer groups oi. four; thusdemonstratingthatthere are-'three-Lls in twelve.

As'ahelp-in teachingcounting., a shieldforrnask` is. provided comprsinatwoarmsl 5l and ljoined: together by a-pivot;y I1; one ofsaidarms, namely-- I 6 in; the.; present.. instance,.. hav-ing: a Width less 1 thantherwidth otthelarm; I5 by. the. diameten off a disk, so that when placed over the face of a chart the counting eld can be selectively divided. As shown, the shield is linearly disposed to expose four full rows of disks and four disks of the next row, so that the child can count or see the four rows of ten, making forty, and then the four single disks in the next row to give the number 44. Since the shield is here used with the counting chart I2, the forty-fourth disk can now be removed exposing the number 44 beneath it as the answer to the ohilds counting. Another use of the shield is shown in Fig. 8, wherein the arms I5 and IG are set at a right angle so that, when placed over the disks Iii, with the product card I3 underneath, any rectangle ofdisks may be exposed for the child to determine the number of disks contained in the rectangle by rst multi-- plying the number on adjacent sides and then picking out the disk at the angle to verify his answer.

In the use of the invention as shown in Fig. 9 for teaching the adding and subtracting oi' sums or minuends of ll to 18, cardboard rectangles i3 I9, 2i) and 2| may be employed to replace certain of the disks and cut down the area used to two rows of the disks, thus reducing the chart or board to a Twenty Board instead of the One Hundred Board. Preferably, in this form a blank side of the board i I is used and no charts are needed. For example, in the beginning of teaching the combination 8 plus '7 equals l5, if eight disks are placed in one row and seven in the other row, the child can then move two disks from the shorter row to the longer row, as indicated by the dotted lines, and then have a row of l0 and a row of 5 or 1.5. At rst the child learns to think in this order- 8 and 2 equals 10; 2 from 7 equals 5; and 8 and 'I equals 15; and then he gradually understands and memorizes the combination as 8 and 7 are l5. Conversely, subtraction of 8 from l5 may be demonstrated by arranging iifteen disks in one row of ten and five ones. The eight disks in the ten row to be subtracted may then be covered by a strip of cardboard. The remaining ones may then be moved over to the five ones. l() leaves 2; 2 and 5 make '7; 8 from l5 leaves 7. This use of two rowsof disks is for second year pupils in learning addition or subtraction or the two table, but as the pupil advances and enters the third year, the rectangular strip 28 can be removed so that teaching can now include three rows of the disks to make adding three numbers or the three table possible. Checking of answers can be done when the product sheet is used beneath the disk and masking means. Likewise, as the pupil advances, the strip i9 can be removed to add two more rows of disks and make possible the extension of multiplication to fours and lives. Also, the eld of teaching can be further expanded by removing one of the rectangles I8 for the reverse of the tables already taught and the rectangle I9 for the rest of the products of the multiplication tables to l0 10.

In the form of the invention shown in Fig. 8, the disks are used in the frame without either of the charts in place. This use of the invention, that is without the counting or product cards, is for teacher demonstration or pupil practice ci the basic techniques involved in solving problems in arithmetic. The successive steps in this type of thinking are the examination of the problem situation; a recall of the underlying principles covering it; the formulation of a hypothesis; selecting the data and working out the solution;

The child thinks, 8 from and the veriilcation of results. By covering some of the disks with shields or masks, various patterns of exposed disks are presented. These patterns may be viewed as problems in which the child is asked How many disks can you now see? In order to determine how many disks are exposed when part are covered, the child must first examine the problem situation, must then determine from his knowledge of relationships or experience what arithmetical principles are involved; must next choose a way to arrive at the correct answer; must then select the data needed and perform the arithmetical operations; and must nally verify his answer by one or more of several methods-common sense consideration of its size, repeating the various steps in the solution, or working it out again in a different way.

For example, instead of using the pivoted shield shown in Figs. 7 and 8, the cardboard rectangles such as I8, I9, 20 and 2| can be used separately to cover certain areas thus forming exposed geometrical patterns. I cardboard I9 is partially superposed on a corner of Fig. 8 so that the area containing the disks in a five disk by four disk pattern is completely covered, the childs attention may be directed to the L-shaped geometrical pattern of the exposed disks. To determine how many disks are now exposed, he may think of the dicks now showing in four ways (a) as a 5 x 10 rectangle and a 6 x 5 rectangle, (b) 4 x 5 rectangle and a 6 x 10 rectangle, (c) a 4 X 5 rectangle, a 6 x 5 rectangle and a 6 x 5 rectangle, (d) a 10 x l0 rectangle less the concealed 4 x 5 rectangle. After seeing any one of these geometrical patterns he forms his hypothesis to arrive at the number of disks exposed, determines the operations to be used and gets an answer which may be checked by one or more of the ways indicated.

Similarly, two cardboards of the size of 20 (Fig. 9) may be superposed in the form of a Maltese cross on Fig. 8 and thus present four rectangular patterns each containing 4 x 4 disks for solution.

All the cards I8, I9, 20, 2l, the pivoted shield Il', and any other cards cut by the ingenious teacher may be used to cover areas of disks, and thus leave exposed geometrie patterns for the pupils to determine the number of disks exposed.

Having described our invention, we claim:

l. An educational device, comprising a chart having numbers arranged thereon sequentially from one to one hundred in ten rows of ten numbers each, a frame for mounting said chart having a peripheral wall projecting beyond the face of said chart, and removable opaque blank faced disks for respectively concealing said numbers and being retained by said wall in an observable arithmetical sequence, whereby the removal of a selected disk exposes a number identifying a particular interrelation of the disks.

2. An educational device, comprising a chart having ten rows of numbers with ten numbers to a row, said numbers being so arranged that each number is a product of the rst number at the left end of a row and the number at the bottom of that number row, a frame for mounting said chart having a peripheral wall projecting beyond the face of said chart, and removable opaque blank faced disks for respectively concealing said numbers and being retained by said wall in an observable arithmetical relationship, whereby the removal of a selected disk exposes a number identifying said product.

3. An educational device, comprising a framed backing, a chart with numbers arranged thereon sequentially from one to one hundred in ten parallel rows of ten numbers each, one hundred readily removable blank disks, but with contrast ing colors on either side, said disks being arranged to ll the frame and to conceal the respective numbers on `the chart beneath them, and a shield having two upper parallel edges spaced apart by the diameter of a disc to form a concealing cover for a portion of the length of a selected row and to form a shoulder for juxtaposition to a selected disc of said selected row, said shield being positionable at will so that the ex posed selected disc in said shoulder represents the end of a sequence of discs, whereby lifting of the selected disc exposes the chart number corresponding to the sum total of the exposed discs.

4. An educational device, comprising a framed backing, a chart having ten rows of numbers with ten numbers to a row, said numbers being so arranged that each number is the product of the first number at the left end of the row and the number at the bottom of that number row, one hundred readily removable disks, blank on both sides but with contrasting colors on either side, said disks being designed to fill the frame and to conceal the respective numbers on the chart placed beneath them, and a right-angled shield for covering certain of the disks so that the total number of disks left exposed within the rightangle, to be determined by multiplying the number of disks on oneside of the exposed rectangle by the number of disks in an adjacent side, can be found on the product chart beneath by lifting the disk within the apex of the right-angle.

FRANCIS A. WADE. WILLIAM METZNER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 356,167 Shannon Jan. 18, 1887 438,757 Bliss Oct. 21, 1890 637,964 Johnsen Nov. 2-8, 1899 898,587 Matthias Sept. 15, 1908 1,403,989 Verneau Jan. 17, 1922 1,668,328 Martien May 1, 1928 1,769,961 Norrell July 8, 1930 1,818,566 McDade Aug. 11, 1931 FOREIGN PATENTS Number Country Date 59,455 Austria June 10, 1913 799,543 France Apr. 4, 1936 

